San Ramon boy, 13, in critical condition after being hit by car

A 13-year-old San Ramon boy who was hit by a car near the Bollinger Canyon Road onramp to southbound Interstate 680 on Thursday is in critical condition at Children's Hospital in Oakland, police said.

The accident occurred about 2:07 p.m. when the boy was riding his bicycle westbound on the sidewalk on Bollinger Canyon Road at the onramp, San Ramon police Lt. Mike Boehrer said. The boy, who was riding just ahead of four other boys walking along the sidewalk, proceeded into a crosswalk at the onramp, where a small passenger vehicle hit him, Boehrer said.

The boy was airlifted via Calstar to Children's Hospital and underwent emergency surgery for head injuries. The boy had a helmet with him but was not wearing it, Boehrer said. His parents have been notified.

The driver of the vehicle stopped and was uninjured, and Boehrer said drugs and alcohol are not suspected to have played a role in the collision. Boehrer said the driver is cooperating with the investigation. It is too early to tell if weather was a factor, he said.

"Sure, clear weather would make it easier to see those in front of you," Boehrer said. "But it's premature to say this wouldn't have happened were it not raining."

Police remained at the scene past 6 p.m., Boehrer said, with all offramps closed while officials investigated.

Staff writer Karl Fischer contributed to this report. Rick Hurd covers public safety. Contact him at 925-945-4780 and follow him on Twitter.com/3rdERH.